1 YEAR SUPPLY OF FILTERS - 5 micron sediment filter (2) , 10 micron Carbon Block filter (4), 100 GPD RO Membrane (1) and 10 micron Post Carbon filter (1) STANDARD SIZE FOR UNIVERSAL FIT: 2.5"OD x 10" height. Fits most under-sink reverse osmosis water filtration system cartridges. Not sure? Contact for sizing help! Each water filter and RO membrane is individually sealed for maximum shelf life and performance Experience AMI expert engineering: RO expertise in membrane application since 1983. ISO:9001:2015 certified Manufacturer AMI Carbon Block RO filters offer superior filtering to standard GAC filters and do not release carbon fines which can damage the RO membrane